API Nitrate Test Kit: A Must-Have for Maintaining Aquarium and Aquaponics Health

Keep your fish and invertebrates healthy with the API Nitrate Test Kit, designed to measure nitrate levels in both fresh and saltwater aquariums as well as aquaponics systems. With a testing range of 0 to 160 ppm, this kit provides 90 tests to ensure optimal water quality and prevent harmful algal blooms.

Features and Benefits

  • Wide Testing Range: Measures nitrate levels from 0 to 160 ppm, catering to various aquatic environments.
  • Compatibility: Suitable for both fresh and saltwater aquariums, as well as aquaponics systems.
  • Comprehensive Testing: Comes with 90 tests per kit to provide accurate nitrate analysis for prolonged periods.
  • Improved Health: Maintaining appropriate nitrate levels promotes the wellbeing of fish and invertebrates by preventing disease and algal growth.
  • Easy to Use: The kit includes a straightforward, step-by-step guide to performing nitrate tests.

How to Use

  1. Fill the test tube with 5 ml of aquarium water.
  2. Add 10 drops of Nitrate Test Solution #1, cap the test tube, and shake it thoroughly.
  3. Add the contents of one Nitrate Test Solution #2 ampoule to the test tube, cap it, and shake the solution for one minute.
  4. Wait five minutes for the colour to develop.
  5. Compare the colour of the solution to the Nitrate Test Colour Chart to determine the nitrate concentration.

Aqua Gardening Suggests These are Best For

The API Nitrate Test Kit is ideal for aquarium and aquaponics system owners who want to ensure a healthy environment for their fish and invertebrates. By allowing you to monitor nitrate levels, the kit enables timely action to maintain optimal water quality and prevent harmful conditions such as algal blooms and fish diseases.


How does the API Nitrate Test Kit work?

The API Nitrate Test Kit is designed to measure nitrate levels in both fresh and saltwater aquariums. It tests nitrate levels ranging from 0 to 160 ppm and can perform up to 90 tests per kit.

Why is it important to test for nitrate in an aquarium or aquaponics system?

Testing for nitrate is crucial as it helps to maintain healthy water quality and minimise the risk of fish diseases. High nitrate levels indicate a build-up of fish waste and organic compounds, which can lead to poor water quality and promote algal blooms. Regular testing (at least once a week) ensures that nitrate levels remain within a safe range for the fish and invertebrates.

What are the recommended nitrate levels for different aquarium types?

For freshwater aquariums, a nitrate level of 40 ppm (mg/L) or less is recommended. In marine aquariums, keeping nitrate levels as low as possible is ideal, particularly for invertebrates. For aquaponics systems, a nitrate level of around 80 ppm is suggested for an established system, while 20-40 ppm is recommended during the first 2-3 months. In a well-established aquaponics system with large fish, nitrate levels up to 120 ppm can be acceptable.

Can the API Nitrate Test Kit be used for both freshwater and saltwater aquariums?

Yes, the API Nitrate Test Kit is designed to work effectively in both fresh and saltwater aquariums.

How often should I test my aquarium water for nitrate levels?

It is recommended to test your aquarium water for nitrate levels once a week. Regular testing helps to ensure that the nitrate levels remain within the desired range and maintain a healthy environment for your fish and invertebrates.

What should I do if my aquarium's nitrate levels are too high?

If the nitrate levels in your aquarium are higher than the recommended limits, consider performing partial water changes, reducing feeding, cleaning the tank and filter, adding live plants, and/or using nitrate-absorbing media. Regular monitoring and maintenance can help keep nitrate levels in check and contribute to a healthier aquarium ecosystem.

Still Unsure if This Product is Right for You?

  • Submit a question via the Reviews & Questions tab on this page, and our team will respond to you
  • Login to check your Aqua Gardening Member Price
  • Book a free Consult with the Aqua Gardening team here
  • Still Overwhelmed? Start your Gardening Journey with a free eBook here

(SKU: 125493)

Measures nitrate levels in both fresh & saltwater aquariums, Tests nitrate levels from 0 to 160 ppm, 90 tests per kit

Shipping Calculator

Enter the quantity of product and your Australian suburb name to calculate the shipping costs for multiples of this item only. You can calculate the shipping costs for your entire order, including international orders, on the Cart Page.

Free Shipping Eligibility

Aqua Gardening offers free shipping on most orders above $249 that are not bulky items.  Once you place all the items you wish to buy in the cart, the combined shipping price will be shown in the cart, including Free Shipping if you are eligible. For full details please see our free shipping eligibility here.

Delivery Information

Back Order products

These are products we usually carry in stock but are temporary out of stock. These products will be back in stock within a few days. We can send you an email notification when they are back in stock if you click on the “Notify me when back in stock” link. See the full details here.

Click & Collect Only products

These products can only be collected from our Brisbane showroom as we can not ship them. If you place any of these products in your cart, you will only see the Click & Collect option at the checkout.

Fast Dispatch products

These are products that we have in stock in our Brisbane showroom, and they are available for immediate Click & Collect or Shipping. Keep in mind that if you have a product which is not listed as a Fast Dispatch product in your cart, there might be a delay on your order. See the full details here.

Special Order products

Special Order products are products that we do not regularly stock. These products will be ordered specially for you, or dispatched directly to you from our supplier. See the full details here.

Ship-To-Store products

Products marked with ship-to-store can still be shipped to us to collect in-store! Simply check out with the shipping address: 3/4 Billabong Street, Stafford, QLD, 4053. Once your order arrives, we’ll email you to let you know that it is ready to collect.


Limited Warranty - This product has been stored in a controlled environment to ensure you will receive the best quality product possible. Due to this reason this product is sold on a strict no refund or return policy, unless it falls under a warranty claim.


60 Day Returns - Not available for this product, please contact us if you have any issues. More details...